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crocodile clip

British  

noun

  1. a clasp with serrated interlocking edges used for making electrical connections

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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He also admitted possessing apparatus to obtain electronic communication services namely wires, cables, crocodile clip and screwdrivers.

From BBC

It's the Crocodile Clip, available in Home Depot stores for about $1.

From Time Magazine Archive